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No tuner is required. Since you're only dealing with the axle back portion of the exhaust, the difference in diameter will be negligible and not effect the tune.
Answered by Karson S. from Hewitt | Comment 0 0
This is an install that you would be able to complete in your driveway. If you do not feel comfortable cutting the rear bumper where required, then you will need to search out a body shop that could install the valance for you. We do have a video that shows the install on the same page as the part. Please give us a call if you have any questions!
Answered by Clint D. from Waco | Comment 0 0
Ford Mustang - 2013 (13) - 2014 (14)